Can I set a module context for a block?

ruby-talk
1

I'd really like to be able to inject the 'include Bob' statement in the
create method of Bob:

module Bob
  def method_missing(name, *params)
    puts "missing: #{name}"
  end
  def self.create(name)
    yield if block_given?
    puts name
  end
end

Bob::create('hi') do
  include Bob
  ldstr
  ldc_i4_0
end

Is there a way that I can avoid include Bob in my block?

Thanks
-John
http://www.iunknown.com

2

John Lam wrote:

I'd really like to be able to inject the 'include Bob' statement in the
create method of Bob:

module Bob
  def method_missing(name, *params)
    puts "missing: #{name}"
  end
  def self.create(name)
    yield if block_given?
    puts name
  end
end

Bob::create('hi') do
  include Bob
  ldstr
  ldc_i4_0
end

Is there a way that I can avoid include Bob in my block?

  def self.create(name)
    module_eval do
      yield
    end if block_given?
    puts name
  end

···

--
Neil Stevens - neil@hakubi.us

'A republic, if you can keep it.' -- Benjamin Franklin

3

John Lam wrote:

I'd really like to be able to inject the 'include Bob' statement in
the create method of Bob:

module Bob
  def method_missing(name, *params)
    puts "missing: #{name}"
  end
  def self.create(name)
    yield if block_given?
    puts name
  end
end

Bob::create('hi') do
  include Bob
  ldstr
  ldc_i4_0
end

Is there a way that I can avoid include Bob in my block?

module Bob
  def method_missing(name, *params)
    puts "missing: #{name}"
  end
  def self.create(name,&b)
    obj = Object.new
    obj.extend Bob
    obj.instance_eval(&b)
    puts name
  end
end

Bob::create('hi') do
  ldstr
  ldc_i4_0
end

irb(main):001:0> module Bob
irb(main):002:1> def method_missing(name, *params)
irb(main):003:2> puts "missing: #{name}"
irb(main):004:2> end
irb(main):005:1> def self.create(name,&b)
irb(main):006:2> obj = Object.new
irb(main):007:2> obj.extend Bob
irb(main):008:2> obj.instance_eval(&b)
irb(main):009:2> puts name
irb(main):010:2> end
irb(main):011:1> end
=> nil
irb(main):012:0>
irb(main):013:0* Bob::create('hi') do
irb(main):014:1* ldstr
irb(main):015:1> ldc_i4_0
irb(main):016:1> end
missing: ldstr
missing: ldc_i4_0
hi
=> nil

Kind regards

    robert

4

Neil Stevens wrote:
[something wrong]

Bah, never mind, I thought I'd removed the 'include Bob' when I tested,
but I hadn't, heh.

···

--
Neil Stevens - neil@hakubi.us

'A republic, if you can keep it.' -- Benjamin Franklin

5

Thanks, Robert! Your solution neatly solves my next problem, which was how
to declare a private context for the evaluation of the method_missing
elements.

Cheers,
-John

module Bob

···

  def method_missing(name, *params)
    puts "missing: #{name}"
  end
  def self.create(name,&b)
    obj = Object.new
    obj.extend Bob
    obj.instance_eval(&b)
    puts name
  end
end